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        <h3 id="离线缓存"><a href="#离线缓存" class="headerlink" title="离线缓存"></a>离线缓存</h3><p>1.通过检测navigator.onLine属性<br>2.通过window下的两个事件 online和offline</p>
<p>appcache应用存储—资源缓存<br>在浏览器缓存中,开辟一个缓存区,下载manifest file中配置的文件,后缀又manifest改为推荐用appcache<br><a id="more"></a><br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div></pre></td><td class="code"><pre><div class="line">---</div><div class="line">CACHE MANEFEST</div><div class="line">#comment</div><div class="line"></div><div class="line">xxx.js</div><div class="line">xxxx.css</div><div class="line"></div><div class="line">---</div><div class="line">通过&lt;html manifest=&quot;xxx.appcache&quot;&gt;关联到html中</div><div class="line">API为applicationCache对象</div><div class="line">属性---status,应用缓存的状态</div><div class="line">        无缓存---0;</div><div class="line">        未更新---1;</div><div class="line">        检查中,下载描述文件检查更新---2;</div><div class="line">        下载中,下载描述文件中的指定的资源---3;</div><div class="line">        更新完成---4;</div><div class="line">        缓存文件不存在---5;</div><div class="line">事件</div><div class="line">    checking---浏览器检查应用缓存更新</div><div class="line">    error---检查更新或者下载资源时发生错误</div><div class="line">    noupdate---检查更新发现无资源无变化</div><div class="line">    downloading---开始下载资源</div><div class="line">    progress---下载期间不断被触发</div><div class="line">    updateready---下载完毕</div><div class="line">    cached---应用缓存完整</div><div class="line">    在加载页面期间,会依次触发</div><div class="line">方法</div><div class="line">    update() 检测更新---依次触发事件</div><div class="line">    swapCache() 在updateready事件触发后,就可以使用swapCache来启用新应用缓存;</div></pre></td></tr></table></figure></p>
<h3 id="cookie"><a href="#cookie" class="headerlink" title="cookie"></a>cookie</h3><p>服务器在http头部发送set-cookie给浏览器<br>浏览器每次访问这个域,就在http头部加上这段cookie<br>cookie由name域value,域,路径,失效时间,安全标志组成;<br>-有的浏览器中的cookie有个数限制,多了会丢弃(通过设置子cookie的方式来避开限制)<br>-cookie要小于4095B(一般一个字符一字节,但是多字符不一定)<br>-浏览器发送的cookie只有name和value<br>—name:不区分大小写,必须经过url编码方式<br>—value:必须url编码<br>—域domain:对于哪个域是有效的<br>—路径path:对于指定域中的哪个路径需要向服务器发送cookie<br>—失效时间expires:GTM时间,到时间删除cookie<br>—安全标志secure:只有在使用ssl连接时才发送cookie<br>eg:</p>
<figure class="highlight"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div></pre></td><td class="code"><pre><div class="line">HTTP1.1 200 ok</div><div class="line">content-type: text/html</div><div class="line">set-cookie:name-value;expires=xxxxx GMT;domain=.xxx.com;path=/;secure;</div><div class="line"></div><div class="line">function setcookie (key,value,expires,path,domain,cookie) &#123;</div><div class="line">    var cookie=encodeURIComponent(key)+"="+encodeURIComponent(value);</div><div class="line">    if(expires instanceof Date)&#123;</div><div class="line">        cookie+="; expires"+expires;</div><div class="line">    &#125;;</div><div class="line">    if(path)&#123;</div><div class="line">        cookie+=";expires="+expires;</div><div class="line">    &#125;;</div><div class="line">    if(domain)&#123;</div><div class="line">        cookie+=";domain="+domain;</div><div class="line">    &#125;;</div><div class="line">    if(secure)&#123;</div><div class="line">        cookie+=";secure";</div><div class="line">    &#125;;</div><div class="line">    document.cookie=cookie;</div><div class="line">&#125;;</div></pre></td></tr></table></figure>
<h3 id="web-storage"><a href="#web-storage" class="headerlink" title="web storage"></a>web storage</h3><p>storage—sessionstorage,localstorage;<br>方法:<br>clear()—删除所有数据<br>getItem(name)—获得值<br>key(index)—索引获得name<br>removeItem(name)—删除name键值对<br>setItem(name,value)—设置键值对<br>事件-storage-支持的少<br>只要发生改变,就会触发storage事件,事件上的属性包括:<br>    demain:发生变化的存储空间的域名<br>    key:设置或者删除的键名<br>    newvalue:新值,如果是删除值,则是null<br>    oldvalue:修改之前的值<br>属性:<br>length</p>
<h3 id="web-sockets"><a href="#web-sockets" class="headerlink" title="web sockets"></a>web sockets</h3><p>XHR—短轮询—浏览器向服务器发送数据,立即响应;<br>comet:<br>长轮询—<br>    XHR+服务器监听事件,过一段时间,然后响应<br>HTTP流—只使用一次http连接–连接后,服务器可以不断传输数据到浏览器<br>    浏览器:XHR+等待(settimeout)+监听readystatechange与readystate===3<br>    通过resposeText接受数据<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div></pre></td><td class="code"><pre><div class="line">再添加一个:</div><div class="line">request.onreadystatechange=<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</div><div class="line">    <span class="keyword">if</span>(request.readyState===<span class="number">3</span>)&#123;</div><div class="line">        data=request.responseText;---data里是所以接受到的数据;</div><div class="line">    &#125;</div><div class="line">&#125;</div><div class="line">服务器端:</div><div class="line">$i=<span class="number">0</span>;</div><div class="line"><span class="keyword">while</span> ($i&lt;<span class="number">5</span>) &#123;</div><div class="line">	echo <span class="string">"number=$i"</span>;</div><div class="line">	ob_flush();</div><div class="line">	flush();</div><div class="line">	sleep(<span class="number">1</span>);</div><div class="line">	$i++;</div><div class="line">&#125;;</div><div class="line">通过xhr和http流,建立双向通话</div></pre></td></tr></table></figure></p>
<p>SSE服务器发送事件-围绕comet的API</p>
<blockquote>
<p>将comet封装成Eventsource对象</p>
</blockquote>
<p>###web Sockets—双向全工通信</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div></pre></td><td class="code"><pre><div class="line">不再使用HTTP协议,而是自定义的socket协议(服务器端apache和nginx不支持),</div><div class="line">不再有同源的概念</div><div class="line">创建对象 var socket=new webSocket(&quot;ws://domain:past/path&quot;)</div><div class="line">属性:</div><div class="line">    readyState:</div><div class="line">        CONNECTING: 0</div><div class="line">        OPEN: 1</div><div class="line">        CLOSING: 2</div><div class="line">        CLOSED: 3</div><div class="line">方法:</div><div class="line">    send();---通过send发送数据(字符)</div><div class="line">    close();</div><div class="line">事件:</div><div class="line">    1.message</div><div class="line">    socket.onmessage=function(e)&#123;</div><div class="line">        var data=e.data;</div><div class="line">    &#125;</div><div class="line">    2.open</div><div class="line">    3.error</div><div class="line">    4.close</div></pre></td></tr></table></figure>
<h3 id="路由"><a href="#路由" class="headerlink" title="路由"></a>路由</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div></pre></td><td class="code"><pre><div class="line">location</div><div class="line">window.location和document.location,都是引用了Location对象</div><div class="line">http://localhost:80/demo/backbone/demo.html[?search=x&amp;name=xx]#/blue</div><div class="line">属性包括:</div><div class="line">    hash:锚部分#/blue</div><div class="line">    host:主机localhost</div><div class="line">    hostname:主机名localhost</div><div class="line">    href:完整url</div><div class="line">    origin:域名:http://localhost</div><div class="line">    pathname:/demo/backbone/demo.html</div><div class="line">    port:端口:80</div><div class="line">    protocol:协议http:</div><div class="line">    search:参数部分search=x&amp;name=xx</div><div class="line">方法:</div><div class="line">    localtion.assign(&quot;url&quot;)---跳转到地址</div><div class="line">    localtion.replace(&quot;url&quot;)---重定位---删除了历史文档,无法返回</div><div class="line">    reload()---重新加载当前页(带参数等)</div><div class="line">事件:</div><div class="line">    hashchange---window对象上触发</div><div class="line">    </div><div class="line">history</div><div class="line">属性:</div><div class="line">    就只有length,无法访问具体网址(防止个人浏览历史被其他脚本获取);</div><div class="line">方法:</div><div class="line">    back---后退</div><div class="line">    forward---前进</div><div class="line">    go---当前为0</div><div class="line">    pushState---web进入新状态就会调用,将该状态添加到历史记录</div><div class="line">    (数据,状态标志,状态url) </div><div class="line">    replaceState---</div></pre></td></tr></table></figure>
      
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